Wireless usage of BT Infinity - speed issues?

Quick question - I'm having BT Infinity installed in my house this weekend (woohoo!) but due to various issues including the BT master socket currently being installed in the loft (don't ask!) and only using a laptop, I intend to use only wireless access to the BT Home Hub only, rather than a wired ethernet connection.

My laptop supports 802.11n and apparently the hub does too, so I wondered whether I'm likely to receive the full throughput of the FTTC connection achieved by the hub? (Suggested by the BT checker to be 62.9Mbs/20Mbs). Or will the use of wireless be a potential bottleneck?

Re: Wireless usage of BT Infinity - speed issues?

Are there any extensions feeding down from the loft to somewhere more convenient ? If so the engineer would be more than happy to bypass the existing master and make the existing extension the NTE, as long as then extension wiring is up to scratch.